Dial-up modems connected early home computers to the internet through ordinary telephone lines, and the handshake sound became familiar in the 1990s as home internet use spread. The noise was the modem and the provider's equipment negotiating a connection, and its long, uncertain wait made it a shared memory for a generation of users. It later resurfaced in memes, reaction videos and retro tech content, where it instantly signals old technology, slow speeds and patience running out.